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Equity Compensation Plans and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Nonvested Stock Options Activity | The following table summarizes the restricted stock unit award activity for the years ended December 31, 2021, 2020 and 2019 (shares in thousands):
| 2021 |  | 2020 |  | 2019
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
| Underlying |  | Fair Value |  | Underlying |  | Fair Value |  | Underlying |  | Fair Value
| Shares |  | of Grant |  | Shares |  | of Grant |  | Shares |  | of Grant
Outstanding at beginning of year | 373 |  |  | $ | 77.40 |  |  | 357 |  |  | $ | 69.13 |  |  | 254 |  |  | $ | 59.53 |
Performance-based grants (1) | 105 |  |  | 58.68 |  |  | 238 |  |  | 78.40 |  |  | 109 |  |  | 86.86 |
Time-based grants | 48 |  |  | 58.68 |  |  | 21 |  |  | 84.93 |  |  | 19 |  |  | 86.86 |
Performance-based vested | (91) |  |  | 72.70 |  |  | (117) |  |  | 48.25 |  |  | (10) |  |  | 45.93 |
Time-based vested | (19) |  |  | 67.86 |  |  | (12) |  |  | 76.84 |  |  | (15) |  |  | 73.78 |
Performance-based canceled (2) | (18) |  |  | 72.56 |  |  | (114) |  |  | 84.93 |  |  | — |  |  | — |
Time-based canceled | (15) |  |  | 72.49 |  |  | — |  |  | — |  |  | — |  |  | — |
Outstanding at end of year | 383 |  |  | $ | 71.93 |  |  | 373 |  |  | $ | 77.40 |  |  | 357 |  |  | $ | 69.13 |
(1)Represents the maximum possible award. The Company’s level of achievement of the respective performance goals will result in actual vesting of between zero shares and the maximum share award. Performance-based grants for 2020 include 114 shares which were subsequently cancelled in 2020 as described in footnote (2) below. (2)Performance-based canceled for 2020 represents cancellation of performance-based awards granted in January of 2020 that were subsequently replaced with a new performance-based award granted in December 2020. The grant date fair value of the December 2020 replacement performance-based awards was $72.37 per share.
Schedule of Stock Options Activity | The following table summarizes stock option activity for the years ended December 31, 2021, 2020 and 2019 (shares in thousands):
| 2021 |  | 2020 |  | 2019
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
| Underlying |  | Exercise |  | Underlying |  | Exercise |  | Underlying |  | Exercise
| Shares |  | Price |  | Shares |  | Price |  | Shares |  | Price
Outstanding at beginning of year | 10 |  |  | $ | 38.00 |  |  | 70 |  |  | $ | 38.86 |  |  | 80 |  |  | $ | 39.00 |
Exercised | (10) |  |  | 38.00 |  |  | (60) |  |  | 39.00 |  |  | (10) |  |  | 40.00 |
Outstanding at end of year | — |  |  | — |  |  | 10 |  |  | 38.00 |  |  | 70 |  |  | 38.86 |
Exercisable at end of year | — |  |  | — |  |  | — |  |  | — |  |  | 40 |  |  | 39.00 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The Company’s net income includes the following compensation costs related to share-based compensation arrangements (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Gross compensation costs: |  |  |  |  |
Restricted stock unit awards | $ | 5,150 |  |  | $ | 2,899 |  |  | $ | 8,637 |
Stock options | — |  |  | 15 |  |  | 43 |
Total gross compensation costs | 5,150 |  |  | 2,914 |  |  | 8,680 |
Income tax benefits: |  |  |  |  |
Restricted stock unit awards | (205) |  |  | (901) |  |  | (302) |
Exercise of stock options | — |  |  | (94) |  |  | (114) |
Total income tax benefits | (205) |  |  | (995) |  |  | (416) |
Net compensation expense | $ | 4,945 |  |  | $ | 1,919 |  |  | $ | 8,264 |

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